JPH02297708A - Production of magnetic head - Google Patents

Abstract

PURPOSE:To lower a cost and to enhance reliability by fixing and integrating center core blocks on a recording and reproducing side and erasing side by heating and welding of the crystallized glass itself to form the blocks into a three-layered structure, then working track grooves and fixing the recording and reproducing and erasing core blocks by welding glass. CONSTITUTION:A nonmagnetic material block 10 is interposed between the recording and reproducing side center core block 8a and the erasing side core block 8b and the blocks are welded by heating and are thereby fixed and integrated into the three-layered structure. The welding temp. of this case is set higher than the welding temp. by the later welding glass and the recording and reproducing side center core block 8a is subjected to the working of the track grooves. The recording and reproducing core block 7, the center core block 14, and the erasing core block 9 are thereafter welded by heating with the welding glass 11 and are thereby fixed and integrated. The magnetic head which is low in cost and is high in reliability is obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head used in a floppy disk device or the like.

[Prior Art] FIG. 4 is a plan view showing a magnetic disk contacting surface of a conventional magnetic head disclosed in, for example, Japanese Patent Laid-Open No. 62-192021;
FIG. 5 is a schematic perspective view showing the manufacturing process. In FIG. 1, (1) is a holder made of non-magnetic ceramics;
(2) is a recording/reproducing core made of ferrite, and (3a) is a center core on the recording/reproducing side.

(3b) is the same erasing side center core, (4) is the same erasing core, and (5) is a nonmagnetic material made of crystallized glass.

(6) is fused glass, (7) is recording/reproducing core block,
(8a) is the recording/playback side center core block; (8b)
) is the erase side center core block, (9) is the erase core block, (lO) is the non-magnetic block, (11) is the fused glass, (12) is the recording/reproduction block, and (13) is the erase block. Further, (g,) is a recording/reproducing gap, and (g2) is an erasing gap.

Next, a method of manufacturing this magnetic head will be explained. First, predetermined track grooves are processed on each core block (7) to (9), and the recording/reproducing core block (7), the recording/reproducing side center core block (8a), the erasing side center core block (8b), and the erasing core are formed. The blocks (9) are joined by heat welding with welded glass (11) to form a recording/reproducing head block (12) and an erasing head block (13), and then a non-magnetic block (10) made of crystallized glass is formed.
) are sandwiched and heat fused to secure and integrate them. The fusing temperature in this case needs to be lower than the welding temperature by 100° C. or more in order to prevent the bonding by the welded glass from moving.

The core block that has been fixed and integrated is further sliced into core chips, which are then sandwiched between holders (1) and (1) and fixed with adhesive to obtain the magnetic head shown in FIG. 4.

[Problems to be Solved by the Invention] In the conventional method of manufacturing a magnetic head, as described above, the recording/reproducing head block and the erasing head block are bonded and assembled using fused glass, and then fixed by heating and fusing the crystallized glass itself. Since it was integrated, it was necessary to perform heat treatment three times in total, resulting in an increase in cost.

In addition, the fusing temperature of the crystallized glass for fixing the recording/reproducing head block and the erasing head block cannot be made higher than the fusing temperature of the welding glass, which may weaken the strength of the crystallized glass or reduce its reliability. There was also the problem that it was low.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method of manufacturing a magnetic head that is low in cost and highly reliable.

[Means for Solving the Problems] In the method for manufacturing a magnetic head according to the present invention, a recording/reproducing side center core block and an erasing side center core block are fixed by heating and fusing crystallized glass itself as a non-magnetic block. After integrating to form a three-layer structure, at least the recording/reproducing side center core block is processed with track grooves, and the grooved recording/reproducing core block and erasing core block are fixed to the surface facing these center core blocks with welded glass. I did it like that.

[Function] In the method for manufacturing a magnetic head of the present invention, the heat treatment
Compared to conventional methods, it only requires two steps: fixing and integrating the center core block by heating and fusing the crystallized glass itself, and fixing the center core block, recording/reproducing core block, and erasing core block using welded glass. There is one less step, and costs can be reduced accordingly.

Furthermore, since heat fusing with crystallized glass is performed before fusing with welding glass, the fusing heating temperature of crystallized glass is set higher than that of welding glass to increase the strength of crystallized glass. Therefore, a highly reliable magnetic head can be obtained.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a plan view showing the magnetic disk contact surface of the magnetic head manufactured according to this embodiment, FIG. 2 is a schematic perspective view showing the center core block during the manufacturing process, and FIG. 3 is a plan view showing the center core block during the manufacturing process. In Figure 0, which is a schematic perspective view showing the joining process of the recording/reproducing core block, center core block, and erasing core block, (1) is a holder made of non-magnetic ceramics, (2) is a recording/reproducing core made of ferrite, ( 3a) is also the center core on the recording/reproducing side.

(3b) is the same erasing side center core, (4) is the same erasing core, (5) is a non-magnetic material made of crystallized glass, (
6) is fused glass, (7) is recording/reproducing core block, (
8a) is the recording/reproducing side center core block, (8b) is the erasing side center core block, (9) is the erasing core block, (10) is the non-magnetic block, (11) is the welded glass, and (14) is the center core. It is a block. Also.

(g□) is a recording/reproducing gap, and (g2) is an erasing gap.

Next, the manufacturing method of this example will be explained.

First, a center core block as shown in FIG. 2 is manufactured. Recording/playback side center core block (8a)
A non-magnetic block (lO) is sandwiched between the erase side core block (8b) and the core block (8b) is heated and fused to form a three-layered structure. The fusing temperature in this case is about 100° C. higher than the fusing temperature of the later welding glass.

Then, the recording/reproducing side center core block (8a) is machined with track grooves, and then, as shown in FIG.
4) The erase core block (9) is heated and welded with a welding glass (1) to be fixed and integrated.

The core block that has been fixed and integrated is further sliced into core chips, which are then sandwiched between holders and fixed with adhesive to obtain the magnetic head shown in FIG. 1.

Table 1 shows a comparison of mechanical properties between magnetic head A manufactured according to an embodiment of the present invention and magnetic head B manufactured by a conventional method.

The crystallized glass crack occurrence rate is data for 10,000 chips, and if a crack occurs, it is considered defective. Moreover, when the surface roughness becomes rough, the sliding life between the magnetic head and the medium becomes short, and reliability decreases.

In the above embodiment, an example was shown in which the grooves were formed only on the recording/reproducing side center core block (8a) of the center core block (14), but the grooves were also formed on the erasing side core block (8b). It's okay.

[Effects of the Invention] As described above, according to the present invention, the recording/reproducing side center core block and the erasing side center core block are fixed and integrated by heating and fusing the crystallized glass itself as a non-magnetic block to form a three-layer structure. After that, track grooves are processed, and then the recording/reproducing core block and the erasing core block are fixed with fused glass, which reduces the heat treatment process by one step, lowers the cost, and also increases the strength of the crystallized glass. This has the effect that a highly reliable magnetic head can be obtained.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the magnetic disk contact surface of the magnetic head manufactured according to this embodiment, FIG. 2 is a schematic perspective view showing the center core block during the manufacturing process, and FIG. 3 is the manufacturing process. A schematic perspective view showing the joining process of a recording/reproducing core block, a center core block, and an erasing core block during the process, FIG. 4 is a plan view showing the magnetic disk facing surface of a conventional magnetic head, and FIG. 5 is its manufacture. It is a schematic perspective view showing a process. In the figure, (7) is a recording/reproducing core block, (8a)
is the recording/reproducing side center core block, (8b) is the erasing side center core block, (9) is the erasing core block, (
10) is a non-magnetic block, and (11) is welded glass. (14) is a center core block. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] Recording and reproducing core block, recording and reproducing side center core block, non-magnetic material block, erasing side center core block,
and a manufacturing method of a magnetic head manufactured by thinly slicing a block in which erasing core blocks are fixed integrally in series, wherein the recording/reproducing side center core block and the erasing side center core block are crystallized as the nonmagnetic blocks. After the compounded glass itself is fixed and integrated by heating and fusing to form a three-layer structure, track grooves are formed on at least the recording/reproducing side center core block, and the recording/reproducing core has grooves formed on the surface facing the center core block. A method for manufacturing a magnetic head, characterized in that a block and an erasing core block are fixed by welding glass.